Calipers.



E. J. STEIN.

I CALIFERS.

APPLICATION FILED JUNE 24. 1915.

COLUMBIA PLANOGRAPH ca, WASHIN c4 Patented Dec. 7, 1915. I

FFIQE EDWARD J. STEIN, OF MURPI-IYSBORO, ILLINOIS.

CAL-IPERS.

Application filed June 24, 1915. Serial No. 36,095.

To all whom it may concern Be it known that I, EDWARD J. STEIN, a citizen of the United States, residing at lVIurphysboro, in the county of Jackson and State of Illinois, have invented certain new and useful Improvements in Calipers, of which the followingis a specification.

My invention relates to calipers andmore particularly double calipers, preferably, though not necessarily, adapted for blacksmiths use.

The primary object of my invention resides in the provision of apair of double calipers, the side arms of which are provided with an improved means for guiding the arms on the center or main arm during the act of adjustment, improved securing means being also associated with the center arm and the guidingmeans for removably and adj ustabl y maintaining the points of the side arms and the center arm in adjusted positions.

Another object of my invention resides in the provision of an independent means for pivoting both of said side arms to the center arm in a manner that the pointed ends of the side arms will lie in the same plane as the double pointed end of the center arm, thus permitting of the. pointed ends to abut each other when so desired.

A further object of my invention resides in the provision of a device of the character described that is simple in construction, efficient in operation and one that can be manufactured and placed on the market at a minimum cost. I

Other objects as well as the nature, characteristic features and scope of my invention will be more readily understood from the following description taken in connection with the accompanying drawingsand pointed out in the claims forming a part of this specification.

In the drawings, Figure 1 is a front elevational view of my invention; Fig. 2 is a fragmentary side elevational view of my invention showing the manner in which the pointed ends of the calipers are arranged in the same plane; Fig. 8 is a front elevational view of one of the side arms showing the guiding means formed integral therewith.

Referring more particularly to the drawings in which similar reference numerals designate corresponding parts throughout the different views, I provide a center arm 1 having the outer end bifurcated as at 2 to Specification of Letters Patent.

Patented Dec. 7, 1915.

provide, a double pointed end including oppositely extending tapering and curved points 3 and 4. Ahandle 5 extends from the opposite end of the center arm, preferably integral therewith, and in which handle is formed an opening 6 whereby the calipers may be suspended from a suitable supporting means when not inuse. The center arm is enlarged intermediate its ends as illustrated to advantage by the numeral 7, said enlarged portion being provided with a pair of similarly formed spaced openings 8, the inner walls of which are arranged in planes in alinement with the planes of the respective sides of the center arm for a purpose to be hereinafter set forth.

:Pivotally connected on the respective sides through the medium of a suitable pivot pin 9 are similarly formed side arms 10, the outer ends of which are curved toward the center arm and tapered to provide points 11 which, due to the bends 12 therein, are adapted to lie in the same plane as the planes of the pointed ends 3 and 41 of the center arm and abut the latter. In order to adjustably maintain the side arms 10 in substantial rigid relation with the centerarm 1 so that various diameters maybe ascertained through the medium of the pointed ends of the arms, I have provided my improved arcuate guides 13 formed integral with the side arms, the said guides being slidably arranged in the openings 8 provided in the enlarged portion 7 of the center arm. In order to removably maintain the guides in various adjusted positions in the openings and consequently maintain the pointed ends in adjusted positions after a diameter has been ascertained, I have provided my improved fastening means in this instance consisting preferably of set screws 14, the latter being removably engaged in openings in outer surfaces of the enlarged portions, the inner ends of said screws being frictionally engaged upon the front faces of the guides and maintain them in clamped position against the inner walls of the openings 8.

The caliper is of especial use to blacksmiths wherein one set of arms can be adjustably maintained in an ascertained diameter for continued or future use, whereas the other set of arms can be continually used for ascertaining various diameters without interfering with the other arms.

Although I have shown and described the preferred form of my invention, I desire to be understood that I am not to be limited to the exact details shown, however, I desire that great stress be laid upon the arrangement of the side arms having their pointed ends bent into the same plane as the double pointed end of the center arm with the guides extending therefrom and arranged in peculiarly positioned openings in the center arm.

From the above description taken in connection with the accompanying drawings, it can easily be seen that I have provided a device that is simple in construction, containing but a few simple parts that can be cheaply manufactured and assembled and when assembled can be placed upon the market and sold at a minimum cost.

It will be understood that the above description and accompanying drawings comprehend only the general embodiment of my invention and that various minor changes in detail of construction, proportion and arrangement of the parts may be made within the scope of the appended claims and without sacrificing any of the advantages of my invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A pair of double calipers including a center arm having a double pointed end, side arms pivoted on opposite faces of the center arm and having their free ends bent and arranged in the plane of the double pointed end of the center arm, and means for maintaining the pointed ends of the curved arms in adjusted relation with the pointed end of the center arm.

2. A pair of double calipers including a center arm having a double pointed end, side arms pivoted on the opposite faces of the center arm and having their free ends bent and arranged in a plane of the double pointed end of the center arm, and arcuate guides extending from the side arms and arranged in sliding adjustable engagement with the center arm for maintaining the pointed ends in adjusted relation with each other.

3. A pair of double calipers including a center arm having a double pointed end, side arms pivoted on the opposite faces of the center arm having their free ends bent and arranged in the plane of the double pointed end of the center arm, arcuate guides extending from the side arms and arranged in sliding engagement with the center arm, and set screws associated with the center arm for removably maintaining the said guides in adjusted positions to con sequently maintain the pointed ends in adj usted relation with each other.

4. A pair of double calipers including a center arm, having one end bifurcated to provide tapering points, said center arm beingenlargedintermediate its ends and provided with a pair of uniformly spaced openings, a handle extending from the opposite end of the center arm, similarly formed side arms plvoted on the opposite faces of the center arm and having thelr free pointed ends bent and arranged in a plane of the points of the center arm, arcuate guides extending from the side arms and slidably arranged in the openings, and said screws passing through the enlarged portions of the center arm for removably. clamping the guidesin adjusted positions to consequently maintain the points in adjusted relation with each other. 7

In testimony whereof I aiiix my signature in presence of two witnesses.

EDWARD J. STEIN. lVitnesses A. R. CARTER, J OHN M. HERBERT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

